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The number on the paddle is the number of the player who is being substituted. This is important due to the volleyball rules on reverse substitutions: if in a set, player B replaces player A, then the only substitution which can be made involving players A and B for the rest of the set is for player A to replace player B again. For example, you cannot do the following substitutions within one set:

Player B replaces player A

Player C replaces player B

This is covered by rule 15.6:

15.6 LIMITATION OF SUBSTITUTIONS

1. 15.6.1
A player of the starting line-up may leave the game, but only once in a set, and re-enter, but only once in a set, and only to his/her previous position in the line-up.

2. 15.6.2
A substitute player may enter the game in place of a player of the starting line-up, but only once per set, and he/she can only be substituted by the same starting player.